Type-writing machine.



E. B. HESS TYPE WRITING MACHINE.

APPLICATION ITILL'ED NOV. 14:, 21 908.

990,736. Patented Apr. 25, 1911.

a sums-81mm 1.

' E. B. HESS.

TYPE WRITING MACHINE.

APPLICATION IILED NOV. 14, 1906.

3 SHEETS-SHEET 2.

Patented Apr. 25, 1911.

E. B. HESS.

TYPE WRITING MACHINE.

APPLICATION FILED 110v. 14, 1908.

990,736. Patented Apr. 25, 1911,

3 SHEETB-SHEET 3.

siding in the borough of Manhattan, city,

pnirnn s ra ns arana ornion.

EDWARD B. HESS, OF NEW YORK, N. Y., ASSIGNOR TO ROYAL TYPE'WRITER COMPANY,

OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

TYPE-WRITING MACHINE.

Application filed November 14, 1908. Serial No. 462,576.

To all whom it may concern:

Be it known that I, EDWARD B. Hess, a citizen of the United States of America, re-

county, and State of New York, have in vented certain Improvements in Type-Writing Machines, -of which the following is a spec1ficat1on.. I

This invention relates to an organlza'tlon providing for the ready removal of the platen and its shaft from the carriage frame; and also certain improvements in the.

line space devices.

In the accompanying drawings: Figure 1 is a plan viewzFig. 2, an elevation taken from the left hand side of the carriage with the platen shaft in section: Fig. 3, a front elevation of the left hand end ofthe platen Fig. 4, a section viewed from the right and taken just inside the right hand end plate of the carriage: Fig. 5, a view similar to Fig. 4 with the platen removed from the carriage and the platen driving line space devices omitted: and Fig. 6, an elevation of the left hand end of the platen showing its ratchet wheel and shaftand the turning knob at one end.

The carriagehas a usual base rail 1 and side plates 2, 3, appropriately connected by tie rods. The front corners of the side plates are recessed as at 4 to receive the platen shaft and the circular bottoms of the recesses form each one-half of the respective platen shaft bearings. secured to it the usual ratchet wheel 6 concentric with which the shaftis formed with an enlarged hub the parts of which 7 8, are separate by an annpla-r recess 9. The curved bottoms of the slots or recesses 4 fit into the annularrecesses 9. Qn the outer side of each end plate is pivoted at 10 a locking arm :11 curved to form a circular recess 12 and having also a thumb piece 13 and a locking nose or cam face 14. The parts are so proportioned that when the locking arms are thrownrearward to lock the platen in the frame, the nose or cam piece 14 frictionally contacts with the face 8 of the enlarged hub but by a gentle, or reasonable amount of pressure may be forced past it so that the. circular recess 12 of the arm embraces one-half the circumference of the part 8 and constitutes the remainder ofthe platen shaft bearingv Pivoted on the left hand side plate in the usual way is the ordi- The platen 5 has nary line space lever 15, the short arm 16, of whlch is connected by a link 17 with a rocker arm 18 having an open circular recess19 turning upon the enlarged part 7' of theplaten shaft hub. This rocking arm 18 carries In its upper end a ratchet driving pawl20 to which is applied a spring 21. As the l 1ne space lever is moved inwardly, the rocklng arm 18 is thrown rearwardly and the driving pawl 20 engages the teeth of the ratchet wheel in rear of a vertical plane passing through its axis.' he line space adiusting device consists of a plate 22 having a clrcular recess 23 that embraces and turns on that part 7 of the platen shaft hub lying between the rocker arm 18 and the ratchet wheel; It isnormally held in engagement with the part- 7 of the platen. shaft by a plate spring 24 whose free end, as in lies the periphery of the ratchet wheel.

This flange is of such dimensions circumferentially, as that it determines the engagethat on rearward movement of the pawl, it will, according to the adjustment of plate. 22, carry the ratchet wheelthrough a partial revolution of one, two, or three teeth to afford three different line spaces. Of course, at the right hand end of the platen, there is only the platen bearing formed by recess 4 of the end plate and thelocking arm ll having the platen bearing circular recess 12.

.ment of pawl 20 with the ratchet wheel so i In Fig. 5, 27 is an ordinary plate spring N carrying ln'bearings in .its'free end a roller 28 that engages the spaces between the teeth of the ratchet wheel and performs the function of a ratchet detent to prevent overthrow of the ratchet. v p

In Fig. 4, in lieu of plate springs 24, 27, there are twolever arms 24 and 27. In

bearingsin the end of arm 24 is a roller 24 adapted to engage the recesses a, b, c, in the plate 22, and in the arm 27' thereis a roller 28 adapted to engage the spaces between the ratchet teeth. Each of these arms has apeyes in the lower ends of threaded bolts 29, 30, that' pass through a flange 31 at 'the upper edge of the left hand side plate of the carriage; and to these screw bolts are applied adjusting nuts 29 30 In this or other appropriate ways, the spring tensions upon the arms 24 and 27 may be adjusted. This construction provides for the use of line spacing devices operating in the well known way and permits of the removal of the platen shaft with the platen and ratchet wheel merely by withdrawing the locking arms 11 without disturbing the relationship of any of the parts.

In the construction disclosed herein the platen shaft bearings are composed in part of recesses in a fixed part of the carriage, z. 6., the end plates, and in part of recesses in the latches 11 and may readily be opened. The rocking pawl carrying arm 18 has also an open recess with a circular bottom upon which it turns or pivots on the platen shaft and the'line space adjusting plate 22 has also an open recess with a circular bottom that turns 01' pivots on the platen shaft. The ratchet wheel 6 is fixed'at the end of the platen. and the turning knob may-be permanently fixed to the shaft. This construction and arrangement of parts makes it possible to have the pawl rocker arm and the adjusting plate turn about the platen axis which 'is a desirable thing in line space devices. By merely throwing open the latches 11 and swinging the partsv 18 and 22 into proper position the platen, its shaft and ratchet, united as shown in Fig. 6, may be removed from the' carriage.

I claim:

1. In a writing machine, a line space. mechanism comprising a revoluble platen,

a ratchet wheel, a rocker arm turning about I the axis of the platen and carrying a ratchet and driving pawl, a detent engaging the ratchet wheel and comprising a pivoted arm and an adjustable coiled spring attached to and imposing spring tension upon the arm, a guard plate serving to determine the throw imparted to the ratchet wheel and having an edge with a plurality of notches in it and a positioning detent adapted to engage either of said notches and'comprising a pivoted arm and an adjustable coiled spring attached to and imposing spring tension upon the arm.

2. The combination with the platen shaft, the platen and ratchet wheel carried thereby and shaft bearings comprising latches adapted to be opened to permit removal of the shaft, of line space devices comprising a ratchet drive awl, an arm on which the pawl is pivote having a circular recess adapted to engage the shaft laterally so that the arm may rock on the shaft as a center and a line space adjusting plate also having a circular recess adapted to engage the shaft laterally so that the plate may turn thereon, whereby by opening the latches the shaft, platen and ratchet may be removed.

3. The combination with the platen shaft, the platen and ratchet wheel carried thereby shaft bearings comprising latches adapted to be opened to ermit removal of the shaft, of line space evices-comprising a ratchet drive pawl and an arm on which the pawl ispivoted having a circular recess adapted to engage the shaft laterally so that the arm may rock on the shaft as a center, whereby by 0 ening the latches the shaft, platen and rate let may be removed.

In testimony whereof, I have hereunt subscribed my name.

EDWARD nnnssy 

